کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298897 1498394 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Wireless electrochemical modification of catalytic activity on a mixed protonic–electronic conductor
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Wireless electrochemical modification of catalytic activity on a mixed protonic–electronic conductor
چکیده انگلیسی

A novel approach to electrochemical modification of catalytic activity using a wireless configuration has been undertaken. This paper presents preliminary results on the modification of a platinum catalyst film supported on a pellet of Sr0.97Ce0.9Yb0.1O3−δ (SCYb), considered to be a mixed protonic–electronic conductor under reducing conditions. The wireless configuration utilises the mixed ionic and electronic conductivity of the supporting membrane to supply an ionic promoting species to the catalyst surface. Control of the flux of this species is achieved by adjusting the effective hydrogen chemical potential difference across the membrane in a dual-chamber reactor with one chamber acting as the “reaction side” and the other as the “sweep side”. The reaction rate can be promoted by up to a factor of 1.6, for temperatures around 500 °C and low reactant concentrations, when hydrogen is introduced on the sweep side of the membrane reactor. The use of helium, moist helium and oxygen in helium as sweep gases did not modify the reaction rate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 178, Issues 7–10, April 2007, Pages 675–680
نویسندگان
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